maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Added an assertion, and updated a comment. 

llvm-svn: 131022
This commit is contained in:
Andrew Trick 2011-05-06 21:52:52 +00:00
parent a3b202643f
commit 2e116a4491
1 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
View File

@ -220,6 +220,10 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
// ExitSU.
AddSchedBarrierDeps();
for (int i = 0, e = TRI->getNumRegs(); i != e; ++i) {
assert(Defs[i].empty() && "Only BuildGraph should push/pop Defs");
}
// Walk the list of instructions, from bottom moving up.
for (MachineBasicBlock::iterator MII = InsertPos, MIE = Begin;
MII != MIE; --MII) {
@ -264,6 +268,7 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
}
std::vector<SUnit *> &UseList = Uses[Reg];
// Defs are push in the order they are visited and never reordered.
std::vector<SUnit *> &DefList = Defs[Reg];
// Optionally add output and anti dependencies. For anti
// dependencies we use a latency of 0 because for a multi-issue
@ -283,9 +288,9 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
DefSU->addPred(SDep(SU, Kind, AOLatency, /*Reg=*/Reg));
}
for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
std::vector<SUnit *> &DefList = Defs[*Alias];
for (unsigned i = 0, e = DefList.size(); i != e; ++i) {
SUnit *DefSU = DefList[i];
std::vector<SUnit *> &MemDefList = Defs[*Alias];
for (unsigned i = 0, e = MemDefList.size(); i != e; ++i) {
SUnit *DefSU = MemDefList[i];
if (DefSU == &ExitSU)
continue;
if (DefSU != SU &&
@ -399,8 +404,6 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
// to the DefList making dependence checking quadratic in the size of
// the block. Instead, we leave only one call at the back of the
// DefList.
//
// NOTE: This assumes that the DefList is ordered!
if (SU->isCall) {
while (!DefList.empty() && DefList.back()->isCall)
DefList.pop_back();